created sense approved 铁杵/鐵杵 · tiěchǔ · iron pestle
铁杵 / 鐵杵
tiěchǔ
iron pestle
a heavy metal tool resembling a thick rod, historically used for pounding or grinding, often used metaphorically for something requiring great patience to refine.
只要工夫深，铁杵磨成针。
noun